Limitations of a ZN-PI Controller for Liquid Level Control of Horizontal Cylindrical Tank

Authors

  • S. Mourouga Pragash  Associate Professor, Department of Electronics and Instrumentation Engineering, Pondicherry Engineering College, Pondicherry, India
  • R. Ananda Natarajan  Professor, Department of Electronics and Instrumentation Engineering, Pondicherry Engineering College, Pondicherry, India

Keywords:

Horizontal Cylindrical Tank, ZN-PI Controller, Liquid Level Control, Nonlinear Process

Abstract

Most chemical processes are inherently nonlinear. However, because of their simplicity, linear control algorithms have been used for the control of nonlinear processes. In this work, horizontally placed cylindrical tanks whose parameters vary with respect to process variable are considered for study. [ Anandanatarajan, R.,Chidambaram,M., and Jayasingh, T., Limitations of PI controller for a first- order nonlinear process with dead time. ISA transactions 45, 185-199(2006)]. The time constant and gain of the chosen process vary as a function of level. The limitations of the conventional PI controller tuned using Ziegler Nichols (ZN) settings for the chosen process are carried out. The servo and regulatory responses for various magnitudes of set point changes and load changes at various operating points with the controller tuned only at a chosen nominal operating point are obtained. Simulation is conducted within MATLAB environment to verify the performances of the system in terms of Settling Time, Overshoot (OS) and Simulation is conducted within MATLAB environment to verify the performances of the system in terms of Settling Time and Overshoot (OS)

References

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International Journal of Scientific Research in Science, Engineering and Technology

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Published

2015-07-30

Issue

Volume 1, Issue 4, July-August-2015

Section

Research Articles

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How to Cite

[1]
S. Mourouga Pragash, R. Ananda Natarajan, " Limitations of a ZN-PI Controller for Liquid Level Control of Horizontal Cylindrical Tank, International Journal of Scientific Research in Science, Engineering and Technology(IJSRSET), Print ISSN : 2395-1990, Online ISSN : 2394-4099, Volume 1, Issue 4, pp.500-511, July-August-2015.